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package com.heliorm;

import com.heliorm.def.Continuation;
import com.heliorm.def.Join;
import com.heliorm.def.On;
import com.heliorm.def.Where;
import com.heliorm.impl.JoinPart;
import com.heliorm.impl.OnPart;
import com.heliorm.impl.WherePart;

import java.util.Arrays;
import java.util.Collections;

/**
 * Static methods for building queries.
 *
 * @author gideon
 */
public final class Query {

    private Query() {
    }

    public static  Where where(Continuation expr) {
        return new WherePart<>(expr);
    }

    public static < LO,  RO> Join join(Table table, On on) {
        return new JoinPart(table, (OnPart) on, null, Collections.EMPTY_LIST);
    }

    public static < LO,  RO> Join join(Table table, On on, Where where) {
        return new JoinPart(table, (OnPart) on, (WherePart) where, Collections.EMPTY_LIST);
    }

    @SafeVarargs
    public static < LO,  RO> Join join(Table table, On on, Join... joins) {
        return new JoinPart(table, (OnPart) on, null, Arrays.asList(joins));
    }

    @SafeVarargs
    public static < LO,  RO> Join join(Table table, On on, Where where, Join... joins) {
        return new JoinPart(table, (OnPart) on, (WherePart) where, Arrays.asList(joins));
    }

    public static < LO,  RO, C> On on(Field leftField, Field rightField) {
        return new OnPart<>(leftField, rightField);
    }
}